Method of treating photographic dry plates or films



UNITED STATES JOSEPH J). BAG-LEY, 0F SPRING'VILLE, UTAH.

METHOD OF TREATING PHOTOGRAPHIC DRY PLATES OR FTLMS.

No Drawing.

To aZZ whom it may concern:

Be it known that l. Josnrn D. BAGLEY, a citizen of the United States, residing at- Springville, in the county 01'? Utah and State of Utah, have invented certain new and useful Improvements in Methods of Treating Photographic Dry Plates or Films; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved method of treating photographic dryplates or films.

One object of the invention is to greatly increase the degree of clearness in the pictures produced from the negatives, especially where cloud effects are being reproduced.

A further object is to attain the above object by a very simple, easy and compara tively inexpensive operation.

Other objects and advantages may become apparent to persons who read the following details of description and appended claim.

My invention consists in utilizing alcohol, unmixed with other ingredients, in the development of photographic dry plates or films, and it has been found by experiment that when negatives are produced on such dry plates, their quality is greatly improved by applying alcohol to the sensitized surface prior to subjecting them to the action of the ordinary developing liquid or composition. In other words, I employ old and well known materials, but I treat them by the following new method z- I take the ordinary plate or film which has been previously treated with a single or double coat of sensitizing material, make the Specification of Letters Patent.

Application filed February 7, 1921.

Patented May 30, 1922..

Serial No. 443,311.

exposure so as to produce an image on the sensitized surface, then immerse the plates or film in pure alcohol for thirty minutes or more, that is, for such a period that each and all pores in the gelatine emulsion, with which the plate or film is coated, are entirely filled with alcohol; after which the plate or film may be placed in any ordinary developer and thereby developed in the usual way. By pure alcohol I mean pure grain alcohol, since denatured alcohol will not serve the purpose of this invention.

The operator must not place the plate or film in water after being immersed in the alcohol, as this will cause the plate or film to develop unevenly. After the plate or film has been removed from the alcohol bath, the ordinary developer is applied. in the ordinary way, and upon printing from a negative developed in this way, it is found that where clouds, water, land and other contrasting objects are photographed, they are all clearly distinguished from one another in the finished photograph.

Having fully described my improved method, what I claim as my invention is:

The method of treating photographic dry plates or films consisting; in subjecting the dry plates or films to the action of alcohol after exposure and be'lore development and while wet with alcohol subjecting them, to the action of a photographic developer.

In testimony whereof .l have hereunto set my hand in the presence of two subscribing witnesses.

JGSEPH D. BAGLEY.

lVitnesses:

D. C. Jonnson, E .rm TTUNTINGTON. 

